精确的球壳瓣片的下料尺寸计算，是设计制造球罐的重要一环。
An exact shell clack sheet's geometric size calculation is the most important link n he design of manufacturing a spherical vessel.
从下料展开尺寸的计算、裁剪、直缝焊接、整圆、压装、环缝焊接、检漏等都有一定的技术难度。
Size is expected to start from the calculation, cutting, straight seam welding, the whole round, press-fit, girth welding, leak detection, have a certain degree of technical difficulty.
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